I developed a +123k REU that can be used as standard multi configurable RAM expansion and as 12x 8k paging on BLK5 for a total of 123k ram available. Only prototype was produced, but if more than 4 people will be interested in getting it then I can draw the PCB and make the REU http://sleepingelepha...

A question: SJLoad work only on PAL VIC20 or on NTSC too? About comparing Tokra $98C40-assembled SJLoad version and my $9800 (SYS40000) assembled version: Tokra's one is a smaller file (less than 1k) and use only I/O3 area (I/O2 free), but it's limited (no SJ-save, no declaring start-stop address.....

This really is a great little card. :D Thanks MCes. Thanks Vicist, I'm happy for your enthusiasm in discovering the potentiality of your "new" VIC20 system... If I remember well the RAM into i/o areas is (now) out of VICE possibilityes.... the real world win! Try the attached file, it sho...

This really is a great little card. :D Thanks MCes. Thanks Vicist, I'm happy for your enthusiasm in discovering the potentiality of your "new" VIC20 system... If I remember well the RAM into i/o areas is (now) out of VICE possibilityes.... the real world win! Try the attached file, it sho...

Yes, I know: Gold is better than Tin, but..... HASL can damage a VIC-20's cartridge port connector in the long run... never heard before.... the worst case after years could be the eventual oxidation of cart fingers, but (oxide) Tin is soft respect to the contact metal into VIC20 connector, the oxid...

Thanks for your words... No, I haven't a blog but you can find on this forum some ideas of mine. It's only a theoretical circuit, but it could near to be working: IMG_0003.GIF Q6 out of registered SIPO and it's negation (/Q6: Q6 via NOT gate) will generate the 2-bits for comparing with IO2 and IO3 l...

Ok, try to follow my idea...... Target: a way to permit at software to set the bank address of the cartridge. Immagine:periferics or memory expansion (RAM/ROM) use every decoded lines (I/O2, I/O3, /BLKs, /RAMs...) My solution: take a serial in parallel out (SIPO) schift register that has this input:...